setBackgroundResource of TextView in listitem

我有一個活動，呈現歌曲曲目listview。當一個項目被點擊時，它會傳送適當的媒體文件。每行都有一個顯示軌道長度的textview。當曲目正在播放時，我將textview的backgroundresource切換到可拖動的暫停按鈕。換句話說，當它準備播放時，它會顯示一個播放按鈕，當它正在播放時會顯示一個暫停按鈕。夠簡單了....setBackgroundResource of TextView in listitem

目前，我做這樣的事情來設置繪製暫停按鈕，如果mediaplayer正在播放：

if(mp.isPlaying()) { _player.setBackgroundResource(R.drawable.pausebtn); _player.setText(" :" + String.valueOf(mp.getDuration()/1000));

我在我的Runnable這樣做哪些有mediaplayer回調onPrepared。

問題是我需要在該列表項中設置drawable，即被點擊並且其軌道正在播放的那個。我怎樣才能抓住哪一個被點擊並將ITS textview設置爲新的drawable？

下面是完整的代碼：

package com.me.player 

import java.net.URL; 
import java.util.ArrayList; 
import org.w3c.dom.Document; 
import org.w3c.dom.NodeList; 
import android.content.Context; 
import android.graphics.Color; 
import android.media.AudioManager; 
import android.media.MediaPlayer; 
import android.media.MediaPlayer.OnCompletionListener; 
import android.media.MediaPlayer.OnErrorListener; 
import android.media.MediaPlayer.OnPreparedListener; 
import android.os.Bundle; 
import android.util.DisplayMetrics; 
import android.view.Gravity; 
import android.view.View; 
import android.view.ViewGroup; 
import android.widget.AdapterView; 
import android.widget.BaseAdapter; 
import android.widget.ListView; 
import android.widget.RelativeLayout; 
import android.widget.TextView; 
import android.widget.AdapterView.OnItemClickListener; 
import com.mtv.datahandler.Artist; 
import com.mtv.datahandler.DataBaseHelper; 
import com.mtv.datahandler.Track; 
import com.mycompany.http.HttpRequest; 


public class ArtistAudio extends ControllerActivity implements OnCompletionListener, OnPreparedListener, OnErrorListener{ 

    private int METHOD_TYPE = 0; 
    private static final int GET_AUDIO = 1; 

    int CURRENT_POSITION = 0; 
    int DURATION = 0; 

    public static final String AUDIO_FEED_URL = "http://direct.rhapsody.com/metadata/data/getTopTracksForArtist.xml?blabla"; 
    public static final int MAX_TRACKS = 200; 
    ArrayList<Track> tracks = new ArrayList<Track>(); 
    Artist artist; 

    private MediaPlayer mp; 
    private int mSongPlaying = 0; 
    TextView _player; 

    @Override 
    protected void progressRunnableComplete() { 
     if(isFinishing()){ 
      return; 
     } 
     if(METHOD_TYPE == GET_AUDIO){ 
      setList(); 
     } 
    } 

    public void setList(){ 
     ListView listview = (ListView)findViewById(R.id.ListView01); 
     //  ListView listview = (ListView)findViewById(R.id.ListView01); 
     if(listview == null){ 
      setContent(R.layout.artistaudio); 
      listview = (ListView)findViewById(R.id.ListView01); 
     } 

     //  listview.addHeaderView(); 
     listview.setCacheColorHint(0); 
     listview.setAdapter(new TrackListAdapter()); 
     listview.setSelector(R.drawable.listbackground); 
     listview.setDividerHeight(1); 
     listview.setDivider(getResources().getDrawable(R.drawable.img_dotted_line_horz)); 
     listview.setOnItemClickListener(new OnItemClickListener(){ 
      @Override 
      public void onItemClick(AdapterView<?> arg0, View arg1, 
        int arg2, long arg3) { 
       // TODO Auto-generated method stub 
       TrackClicked(arg2); 
      } 
     }); 
    } 

    public void TrackClicked(int arg2){ 



     mSongPlaying = arg2; 


     Track track = tracks.get(arg2); 
     String url = track.requestInfo("previewURL"); 

     mHandler.post(new PlaySong(url)); 









//  mHandler.post(new PlaySong("http://dc237.4shared.com/img/315443275/33f14ef2/dlink__2Fdownload_2F9y5VGjVt_3Ftsid_3D20100705-131850-40aa0b87/preview.mp3")); 
    } 

    public void setDuration(int n) { 
     DURATION = n; 

    } 

    @Override 
    public void onCreate(Bundle savedInstanceState) { 
     super.onCreate(savedInstanceState); 
     setTitle("Audio Clips"); 
     setContent(R.layout.artistaudio); 

     Object o = getIntent().getParcelableExtra("artist"); 
     if(o!=null){ 
      artist = (Artist)o; 
     } 

     progressRunnable(new Runnable(){ 
      public void run(){ 
       getTracks(); 
      } 
     }, "Loading. Please Wait...",false); 


    } 

    protected void getTracks() { 
     METHOD_TYPE = GET_AUDIO; 
     if(!DataBaseHelper.isOnline(this)){ 
      RUNNABLE_STATE = RUNNABLE_FAILED; 
      return; 
     } 
     HttpRequest req; 
     try { 
      req = new HttpRequest(new URL(AUDIO_FEED_URL+artist.requestInfo("rhapsodyID"))); 
      Document doc = req.AutoXMLNoWrite(); 
      NodeList items = doc.getElementsByTagName("e"); 
      tracks= new ArrayList<Track>(); 
      for(int i=0; i<items.getLength(); i++){ 
       Track newsitem = new Track(items.item(i)); 
       tracks.add(newsitem); 
      } 
      RUNNABLE_STATE = RUNNABLE_SUCCESS; 
     } catch (Throwable e) { 
      RUNNABLE_STATE = RUNNABLE_FAILED; 
      e.printStackTrace(); 
     } 
    } 

    public void onPause(){ 
     super.onPause(); 
     try{mp.stop();}catch(Exception e){e.printStackTrace();} 
     try{mp.reset();}catch(Exception e){e.printStackTrace();} 
     try{mp.release();}catch(Exception e){e.printStackTrace();} 
     mp = null; 

    } 

    private class TrackListAdapter extends BaseAdapter{ 

     @Override 
     public int getCount() { 
      // TODO Auto-generated method stub 
      return tracks.size(); 
     } 

     @Override 
     public Object getItem(int position) { 
      // TODO Auto-generated method stub 
      return tracks.get(position); 
     } 

     @Override 
     public long getItemId(int position) { 
      // TODO Auto-generated method stub 
      return position; 
     } 

     @Override 
     public View getView(int position, View convertView, ViewGroup parent) { 
      // TODO Auto-generated method stub 
      AudioCell blogView = null; 
      if (convertView != null) { 
       if(convertView.getClass() == TextView.class){ 
        convertView = null; 
       } 
      } 
      if (convertView == null) { 
       blogView = new AudioCell(parent.getContext()); 
      } 
      else { 
       blogView = (AudioCell) convertView; 
      } 
      blogView.display(position); 
      return blogView; 
     } 
    } 

    /** this class is responsible for rendering the data in the model, given the selection state */ 
    class AudioCell extends RelativeLayout { 

     TextView _title; 



     int currentPosition; 



     public AudioCell(Context mContext) { 
      super(mContext); 
      _createUI(mContext); 
     } 

     /** create the ui components */ 
     private void _createUI(Context m) { 


      RelativeLayout.LayoutParams params; 
      DisplayMetrics metrics = new DisplayMetrics(); 
      getWindowManager().getDefaultDisplay().getMetrics(metrics); 
      params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT); 

      _player = new TextView(m); 
      _player.setId(2); 
      _player.setBackgroundResource(R.drawable.playbtn); 
      _player.setText(":30"); 





      addView(_player); 
      params.addRule(RelativeLayout.CENTER_VERTICAL,1); 
      _player.setLayoutParams(params); 


      _title = new TextView(m); 
      _title.setTextColor(Color.BLACK);  
      params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,(int)(44*metrics.density)); 
      params.addRule(RelativeLayout.CENTER_VERTICAL,1); 
      params.addRule(RelativeLayout.RIGHT_OF, _player.getId()); 

      params.setMargins(0, 10, 0, 10); 
      _title.setGravity(Gravity.CENTER_VERTICAL); 
      _title.setLayoutParams(params); 
      _title.setId(102); 
      addView(_title); 
      params = new RelativeLayout.LayoutParams(LayoutParams.WRAP_CONTENT,(int)(44*metrics.density)); 

//   _player.setOnClickListener(new View.OnClickListener() { 
//    
//    @Override 
//    public void onClick(View v) { 
//     PlaySong.PlaySong("http://http://www.noiseaddicts.com/samples/2544.mp3"); 
//     
//    } 
//   }); 
//   














     } 

     /** update the views with the data corresponding to selection index */ 
     public void display(int index) { 
      _title.setText(tracks.get(index).requestInfo("name")); 
     } 
    } 

    private class PlaySong implements Runnable{ 
     String songURL; 

     public PlaySong(String url){ 
      songURL = url; 
     } 

     public void run(){ 
      try{mp.stop();}catch(Exception e){e.printStackTrace();} 


      try{mp.reset();}catch(Exception e){e.printStackTrace();} 

      if(mp==null){ 
       createPlayer(); 
      } 
      try{mp.reset();}catch(Exception e){e.printStackTrace();} 
      try{mp.setAudioStreamType(AudioManager.STREAM_MUSIC);}catch(Exception e){e.printStackTrace();} 
      try{mp.setDataSource(songURL);}catch(Exception e){e.printStackTrace();} 
      try{mp.prepareAsync();}catch(Exception e){e.printStackTrace();} 



     } 
    } 

    public void createPlayer(){ 
     mp = new MediaPlayer(); 
     mp.setOnCompletionListener(this); 
     mp.setOnPreparedListener(this); 
     mp.setOnErrorListener(this); 
     mp.setAudioStreamType(AudioManager.STREAM_MUSIC); 
    } 

    @Override 
    public void onCompletion(MediaPlayer mp) { 
     // TODO Auto-generated method stub 
     try{mp.reset();}catch(Exception e){e.printStackTrace();} 
//  if(mSongPlaying<tracks.size()-1) 
//  { 
//   TrackClicked(mSongPlaying+1); 
//  } 



     _player.setBackgroundResource(R.drawable.playbtn); 

    } 

    @Override 
    public void onPrepared(MediaPlayer inMP) { 
     // TODO Auto-generated method stub 



     mp.start(); 
     if(mp.isPlaying()) { 
      _player.setBackgroundResource(R.drawable.pausebtn); 
      _player.setText(" :" + String.valueOf(mp.getDuration()/1000)); 


     } 

    } 

    @Override 
    public boolean onError(MediaPlayer mp, int what, int extra) { 
     // TODO Auto-generated method stub 
     return false; 
    } 
}

正如你看到的，我的延伸RelativeLayout內部類AudioCell是我使用的是什麼我ListView ....

有什麼想法行？我應該在哪裏設置drawable，以及如何確保它僅對被點擊的行進行確認（即，對於實際正在播放的曲目）。

來源

2011-05-23 LuxuryMode

變化TrackClicked方法的siggnature。同時通過arg1和arg3從onItemClick並在TrackClicked方法做到這一點arg1.setBackgroundResource(R.drawable.thebackground);

來源

2011-05-23 04:02:53 pankajagarwal

設置整行的背景資源。我想在行內設置一個textview的背景。 – LuxuryMode 2011-05-23 14:32:43

然後試試這個。將'arg1'強制轉換爲'AudioCell'。假設你想改變'_title'字段的背景，試試這個'（（AudioCell）arg1）._ title.setBackgroundResource（R.drawable.thebackground）;' – pankajagarwal 2011-05-24 05:06:53

裏面你TrackClicked方法，補充一點：

getAdapter().getChildAt(arg2).setBackgroundResource(R.drawable.thebackground);

來源

2011-05-23 02:12:01 Jodes

通話'getAdapter'是什麼？ – LuxuryMode 2011-05-23 14:02:43

setBackgroundResource of TextView in listitem

回答

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